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A prospective noncontrolled study of the safety and potential efficacy of the metallic stent was performed on 32 patients with benign prostatic hypertrophy. Mean age was 76.6 years (range, 56-98 years), and mean prostatic volume was 24.2 cm3. The patients were selected on the basis of a quantitative symptom score (QSS), uroflowmetry measurements, and residual urine volume (RU). Nineteen patients had urinary retention and remaining 13 patients had moderate symptoms and signs of prostatism. Placing the stent was successfully done in 31 patients (97%). It took 15 minutes to place the stent using transabdominal and/or endorectal sonography. After 3 months, 27 patients (87%) showed improved QSS. In patients with dysuria, maximum flow rate (MFR) and RU before treatment were 6.9 +/- 1.7 ml/sec and 112.3 +/- 61.8 ml, respectively. After treatment, they improved to 12.3 +/- 2.7 ml/sec and 12.7 +/- 6.7 ml, respectively. On the other hand, all patients who had urinary retention were able to urinate just after treatment, and MFR and RU were 12.9 +/- 3.6 ml/sec and 24.4 +/- 43.3 ml, respectively. Evaluation on the basis of improvement in MFR and reduction in RU showed that the stent was effective in 71% of total patients (22 out of 31 patients), 94% of the patients with urinary retention (17 out of 18 patients). The overall clinical efficacy of this stent was 68% (21 patients). There were no major complications such as urge incontinence and urinary tract infection during follow-up. Although proximal migration of the stent was observed in 6 patients, the stent could be taken out and replaced in 4 patients. From the above results, we conclude that the metallic stent is useful for the treatment of prostatism and urinary retention.

THE USE OF A METALLIC STENT IN 32 PATIENTS WITH BENIGN PROSTATIC HYPERTROPHY